| Postal Pickup Limited | Transport & logistics | 2018 |
| Powercore Engineering Limited | Manufacturing | 2026 |
| Powercore Group Limited | Financial services | 2026 |
| Powered by Sales Solutions Limited | Wholesale & retail | 2021 |
| Powergen Consultancy Services (N.I.) Ltd | Professional & scientific | 2022 |
| PPG Consultancy Limited | Professional & scientific | 2013 |
| PPP Tax Advisers Ltd | Professional & scientific | 2019 |
| PR Team Limited | Information & communication | 2014 |
| Precision Mechanical Contractors Ltd | Construction | 2010 |
| Precision NI Holdings Ltd | Administrative & support | 2021 |
| Precision Processing Services Limited | Professional & scientific | 1999 |
| Predator Zone Ltd | Arts & recreation | 2014 |
| Prehen Property Services Limited | Professional & scientific | 2023 |
| Prehen Services Ltd | Hospitality | 2023 |
| Prehen Woods Management Company Limited | Real estate | 2015 |
| Premier Equipment Sales Ltd | Wholesale & retail | 2017 |
| Premier Paws Ltd | Agriculture & fishing | 2025 |
| Premium Security Plus Limited | Administrative & support | 2025 |
| Premium Vapours Strand Ltd | Wholesale & retail | 2020 |
| Preppedbywardy Consultancy Limited | Professional & scientific | 2021 |
| Prima Fitness Equipment Limited | Wholesale & retail | 2020 |
| Prime Coat Renovations Ltd | Construction | 2025 |
| Primrose Boutique Limited | Wholesale & retail | 2026 |
| Primrose on the Quay Ltd | Hospitality | 2019 |
| Princes Port Properties Limited | Real estate | 2021 |
| Print Chameleon Ltd | Manufacturing | 2024 |
| Pristine Competitions Ltd | Wholesale & retail | 2019 |
| Pristine Group UK Limited | Wholesale & retail | 2021 |
| Pristine Joinery Ltd | Construction | 2023 |
| Pro K Ltd | Professional & scientific | 2015 |
| Pro Lift Global Ltd | Construction | 2020 |
| Pro-Gym Limited | Arts & recreation | 2014 |
| Proaptivity Limited | Information & communication | 2005 |
| Procon Solutions Limited | Construction | 2016 |
| Procore Project Management Limited | Construction | 2026 |
| Production Kitchen T/A Fuel Strong Ltd | Manufacturing | 2026 |
| Profix Surface Solutions Limited | Water & waste | 2017 |
| Progressive Arable Producers Limited | Agriculture & fishing | 2003 |
| Progressive Safety Ltd | Professional & scientific | 2020 |
| Project 212 Limited | Real estate | 2021 |
| Project Advisory Ltd | Professional & scientific | 2025 |
| Project Burn Ltd | Hospitality | 2024 |
| Project Ceilings Ltd | Construction | 2019 |
| Project Plug Holdings Limited | Financial services | 2022 |
| Project X Raves Ltd | Arts & recreation | 2024 |
| Project Zero Carbon Limited | Construction | 2019 |
| PROJECT2SOLUTIONS Limited | Construction | 2019 |
| Proline Contracts Ltd | Construction | 2025 |
| Promech-Group Ltd | Professional & scientific | 2026 |
| Property Developers Group Ltd | Real estate | 2020 |
| Property Hold Limited | Administrative & support | 2013 |
| Property Link (Derry) Ltd | Real estate | 2007 |
| Property Link (North West) Ltd | Real estate | 2020 |
| Property Link Block Management - Mullaghboy Glen Ltd | Real estate | 2014 |
| Property Link Block Management - Mullaghboy Park Ltd | Real estate | 2013 |
| Property Link Block Management Ltd | Administrative & support | 2015 |
| Property Rental Developments Limited | Real estate | 2019 |
| Psykor Mental Health Ltd | Health & social care | 2026 |
| PTL Contracts Limited | Construction | 2019 |
| Ptmd Properties Ltd | Households | 2025 |
| Puff in Stuff Limited | Wholesale & retail | 2024 |
| Pulse Event Medical Services NI Ltd | Health & social care | 2021 |
| Pulse Security Management Ltd | Administrative & support | 2016 |
| Pump Street Productions Limited | Information & communication | 2024 |
| Pumping Global Strategies Ltd | Manufacturing | 2025 |
| Pure Derry Ltd | Wholesale & retail | 2021 |
| Purewal Catering Ltd | Hospitality | 2025 |
| Purple Door Developments Ltd | Real estate | 2018 |
| Purple Door Investments Limited | Real estate | 2019 |
| Purple Sky (IRL) Ltd | Professional & scientific | 2022 |
| PVC Window Warehouse Ltd | Construction | 2018 |
| Pyke and Brolly Properties Limited | Real estate | 2023 |
| Pyke N Pommes Limited | Hospitality | 2016 |
| QCD Solutions Limited | Administrative & support | 2017 |
| QQN Ltd | Real estate | 2022 |
| Qsteel Ltd | Construction | 2025 |
| Quantum Holdings (Campsie) Limited | Wholesale & retail | 2024 |
| Quartz Holdco Limited | Financial services | 2022 |
| Quay Developments Limited | Real estate | 1996 |
| Quayside Derry Ltd | Real estate | 2017 |
| Quayside Riverfront Limited | Hospitality | 2025 |
| Quayside Rugs Ltd | Wholesale & retail | 2023 |
| Qubizm Limited | Education | 2009 |
| Questern Ltd | Information & communication | 2022 |
| Quigg Contracts Limited | Construction | 2024 |
| Quigley Cars Ltd | Wholesale & retail | 2022 |
| Quigley Crane Services Limited | Administrative & support | 2003 |
| QXE Ltd | Wholesale & retail | 2026 |
| R & C Killen Ltd | Agriculture & fishing | 1999 |
| R & G Downey Limited | Other services | 2016 |
| R & H Hall Trading Limited | Manufacturing | 2006 |
| R M R Properties Limited | Real estate | 1988 |
| R Parkhill Limited | Construction | 2008 |
| R&B Partitions Ltd | Construction | 2023 |
| Racing Connected Ltd | Information & communication | 2024 |
| Radius Business Solutions (NI) Limited | Wholesale & retail | 1997 |
| Raes Associates Limited | Professional & scientific | 2026 |
| Rafferty Construction Limited | Construction | 2020 |
| Rags Medical Limited | Wholesale & retail | 2023 |
| RAI Brow Bar Limited | Other services | 2024 |